Please attach each file as a separate attachment.

This looks very similar to bug 10118. Pango is passing invalid glyph positions for glyphs 2 to 6.

{index = 2173, x = 1000.0000000000001, y = -939.99999999999989}
{index = 2240, x = 103399.90625, y = -939.99999999999989}
{index = 2186, x = 205799.8125, y = -939.99999999999989}
{index = 2307, x = 308199.71875, y = -939.99999999999989}
{index = 2329, x = 410599.625, y = -939.99999999999989}
{index = 12655, x = 512999.53125, y = -939.99999999999989}

Adrian, so you can reproduce this?
Pango doesn't make up extents.  One can see what's wrong by checkout output of cairo_scaled_font_extents() and cairo_scaled_font_glyph_extents().

cairo_show_glyphs is called 3 times.

font extents: ascent: 90.000000   descent: 30.000000    height: 129.000000    max_x_adv: 0.000000    max_y_adv: 129.000000
glyph extents: xbearing: 10.906250   ybearing: -42.750000    width: 78.093750    height: 85.500000    x_adv: 102399.906250    y_adv: 0.000000
glyph extents: xbearing: 13.000000   ybearing: -32.046875    width: 74.000000    height: 64.093750    x_adv: 102399.906250    y_adv: 0.000000
glyph extents: xbearing: 8.593750   ybearing: -30.906250    width: 82.703125    height: 61.796875    x_adv: 102399.906250    y_adv: 0.000000


font extents: ascent: 90.000000   descent: 30.000000    height: 129.000000    max_x_adv: 0.000000    max_y_adv: 129.000000
glyph extents: xbearing: 8.906250   ybearing: -36.859375    width: 82.109375    height: 73.703125    x_adv: 102399.906250    y_adv: 0.000000
glyph extents: xbearing: 19.000000   ybearing: -38.046875    width: 61.890625    height: 76.093750    x_adv: 102399.906250    y_adv: 0.000000


font extents: ascent: 85.937500   descent: 14.062500    height: 100.000000    max_x_adv: 0.000000    max_y_adv: 100.000000
glyph extents: xbearing: 11.828125   ybearing: -50.203125    width: 101.187500    height: 100.390625    x_adv: 102400.000000    y_adv: 0.000000

x_adv: 102399.906250...  Can you set a breakpoint in _cairo_ft_scaled_glyph_init() and see what's going wrong?

at _cairo_scaled_glyph_set_metrics (scaled_glyph,
					 &scaled_font->base,
					 &fs_metrics);

fs_metrics has the value: 
$6 = {x_bearing = -0.32046875000000002, y_bearing = 0.13, width = 0.64093750000000005, height = 0.73999999999999999, x_advance = 0,
  y_advance = 1023.9990625}


The y advance is coming from:

  fs_metrics.y_advance = DOUBLE_FROM_26_6 (glyph->linearVertAdvance) * y_factor;

where y_factor is 0.01 and *glyph is

$8 = {library = 0x9f6bec8, face = 0x9faf368, next = 0x0, reserved = 0, generic = {data = 0x0, finalizer = 0}, metrics = {width = 4102,
    height = 4736, horiBearingX = 1197, horiBearingY = 4883, horiAdvance = 6400, vertBearingX = -2051, vertBearingY = 832,
    vertAdvance = 6400}, linearHoriAdvance = 6553594, linearVertAdvance = 6553594, advance = {x = 6400, y = 0},
  format = FT_GLYPH_FORMAT_OUTLINE, bitmap = {rows = 0, width = 0, pitch = 0, buffer = 0x0, num_grays = 0, pixel_mode = 0 '\0',
    palette_mode = 0 '\0', palette = 0x0}, bitmap_left = 0, bitmap_top = 0, outline = {n_contours = 1, n_points = 59,
    points = 0x9fd7c08, tags = 0x9fd80d0 "\001", contours = 0x9fd7bf8, flags = 0}, num_subglyphs = 0, subglyphs = 0x0,
  control_data = 0x0, control_len = 0, lsb_delta = 0, rsb_delta = 0, other = 0x0, internal = 0x9fb21b0}

and face is

$9 = {num_faces = 1, face_index = 0, face_flags = 2585, style_flags = 2, num_glyphs = 2398, family_name = 0x8708fe0 "FreeSerif",
  style_name = 0x8709000 "Bold", num_fixed_sizes = 0, available_sizes = 0x0, num_charmaps = 3, charmaps = 0x8709050, generic = {
    data = 0x86e0b00, finalizer = 0xb7c1abd0}, bbox = {xMin = -560, yMin = -488, xMax = 1860, yMax = 1173}, units_per_EM = 1000,
  ascender = 900, descender = -300, height = 1290, max_advance_width = 1880, max_advance_height = 1290, underline_position = -125,
  underline_thickness = 50, glyph = 0x8709108, size = 0x8709248, charmap = 0x8709080, driver = 0x86c2f90, memory = 0x86c2eb0,
  stream = 0x8706338, sizes_list = {head = 0x8709380, tail = 0x8709380}, autohint = {data = 0x0, finalizer = 0}, extensions = 0x0,
  internal = 0x87066a8}

Can you figure out which font, which version of the font, and which version of freetype this is?  pmap'ing the process may help.  Thanks.

The font is FreeSerifBold.ttf on Debian Lenny. You can obtain the exact same font from 

http://ftp.us.debian.org/debian/pool/main/t/ttf-freefont/ttf-freefont_20080323-3_all.deb

Use ar to unpack the deb.

The freetype version is 2.3.7. This page has a link to the exact version and Debian specific patches:

http://packages.debian.org/lenny/libfreetype6

Fixed:

commit 4232719af968ed05636fe34f2ffe2520dc02d737
Author: Behdad Esfahbod <behdad@behdad.org>
Date:   Sat May 30 23:03:55 2009 -0400

    [ft] Fix vertical advance metrics of bitmap fonts (#21985)

diff --git a/src/cairo-ft-font.c b/src/cairo-ft-font.c
index 8a6b4a2..6c64284 100644
--- a/src/cairo-ft-font.c
+++ b/src/cairo-ft-font.c
@@ -1979,7 +1979,7 @@ _cairo_ft_scaled_glyph_init (void                 *abstract_font,
                if (hint_metrics || glyph->format != FT_GLYPH_FORMAT_OUTLINE)
                    fs_metrics.y_advance = DOUBLE_FROM_26_6 (metrics->vertAdvance) * y_factor;
                else
-                   fs_metrics.y_advance = DOUBLE_FROM_26_6 (glyph->linearVertAdvance) * y_factor;
+                   fs_metrics.y_advance = DOUBLE_FROM_16_16 (glyph->linearVertAdvance) * y_factor;
            }
         }
 

Created attachment 26340 [details]
Same behaviour with compilation with git trunk

try patch with
GLIB_VERSION:2.20.1
PANGO_VERSION:1.24.2
CAIRO_VERSION:1.9.1
same behaviour

Adrian, can you check too?

(In reply to comment #10)
> Created an attachment (id=26340) [details]
> Same behaviour with compilation with git trunk
> 
> try patch with
> GLIB_VERSION:2.20.1
> PANGO_VERSION:1.24.2
> CAIRO_VERSION:1.9.1
> same behaviour
> 

Works for me. The PDF you attached was created with cairo 1.8.6.